php shell_exec doesn't work in browser but works in terminal

Question

I'm working on shell_exec and it doesn't run in browser but works in terminal. Here's my code:

<?php
    echo 1;

    shell_exec ("gpg --output /home/datafeeding/testing/sampledick.xls.gpg --encrypt --recipient rtalplacido@yahoo.com /opt/jasperserver-3.5.0/apache-tomcat/webapps/JavaBridge/reports/sampledick.xls");

    echo 2;
    echo "<br>";

?>

It echo 2 , it just passes through the shell exec

Answer 1

http://php.net/manual/en/function.shell-exec.php

Note: This function is disabled when PHP is running in safe mode.

Also, add full path you gpg binary - /usr/bin/gpg

See this post: GPG Error Code 2